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Finding the Fourth Proportional to 20,283.70, 28,012.90 and 15,520.90

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Solution

The fourth proportional to 20,283.70, 28,012.90 and 15,520.90 is: 21,435.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,283.70 : 28,012.90 = 15,520.90 : x
  2. Step 2: Convert to fraction form
    20,283.70/28,012.90 = 15,520.90/x
  3. Step 3: Cross multiply
    20,283.70x = 28,012.90 × 15,520.90
  4. Step 4: Simplify right side
    20,283.70x = 434,785,419.61
  5. Step 5: Solve for x
    x = 434,785,419.61/20,283.70
  6. Step 6: Final answer
    x = 21,435.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.